OSMC - Open Source Media Center
OSMC is a free and open source media center built for the people, by the people.
MagicMirror
Piwigo
Streama
Self hosted media server
Jellyfin - The Free Software Media System
The volunteer-built media solution that puts you in control of your media. Stream to any device from your own server, with no strings attached.
Kodi - Open Source Home Theater Software
Kodi is a free media player that is designed to look great on your big screen TV but is just as at home on a small screen.